Blue giants and red giants are two major categories of stars. Based on what you have learned about the relationship between temperature and color, which of these types of stars would you expect to be hotter? Explain your reasoning.

What types of evidence enable scientists to make inferences about the sizes, temperatures and distances of stars?

What can parallax be used to determine? a. the composition of stars based on the spectra of their starlight, b. the distance to a star that is within 1,000 light years of Earth, c. the temperature of the surface of a star that is within 1,000 light years of Earth, d. the distance to extremely distant stars.

Suppose you observe absorption spectra from three galaxies. All contain the same number of absorption lines. The lines have the same spacing in all three spectra. Lines in the first spectrum show blueshift, lines in the second match laboratory emission lines, and lines in the third show redshift. Which of the following statements is correct? a. The differences in the line positions are due to differences between absorption spectra and emission spectra. b. The differences in the line positions show that the galaxies are composed of different elements. c. The blueshifted lines of the first galaxy show that it is moving away from Earth. d. The redshifted lines of the third galaxy show that it is moving away from Earth.

The equations for two different sound waves are $f(t)=2 \sin 240 \pi t$ and $g(t)=0.8 \sin 300 \pi t$.

Determine the periods of $f, g$, and $h$.

Select and record the correct responses to complete the following statements. You have learned that the frequency of sound waves reaching a stationary observer will change depending on whether the source of the sound is approaching or receding. Suppose an ambulance is approaching and then passes you and drives away without changing speed. As an ambulance approaches, the sound waves (expand, compress), resulting in a (higher, lower)-frequency wave. As the ambulance passes, the pitch (increases to a higher frequency, drops to a lower frequency).

If $P(E)=0.4,\ P(F)=0.6,$ and $P(E\cup F)=0.7,$ what is $P(E|F)?$ Are E and F independent?

Find $\frac{d^{3} y}{d x^{3}}$ if $y=\sqrt{x}-\frac{1}{2 x}+\frac{x}{\sqrt{2}}.$

Explain the difference between a group and a period on the periodic table.

(a) How do Pyramus and Thisbe's wishes differ from those of their families? (b) In what way do those differences lead to tragedy? [Connect to the Big Question: Do our differences define us?]

Describe a real-world situation in which there is an additive or multiplicative relationship between two quantities. Make a table that includes at least three pairs of values. Then write an equation that models the relationship between the quantities .

Classify each as a strong or weak acid or base:

RbOH

Insert the given number of arithmetic means between the numbers. Four arithmetic means between 5 and 25

Describe the steps for subtracting $\frac { x - 6 } { x + 5 }$ from $\frac { x ^ { 2 } - x - 30 } { x + 5 }$